# SPC Severe Weather Database Changelog
04 December 2018:
* FIX: Fixed bug that caused the wind column indicating measured/estimated
to not be included in the shapefiles.
09 September 2018:
* FIX: Emergency fix to correct incorrect time conversions to CST during Daylight Saving Time for some recent tornadoes
* CHANGE: Changed start/end points and rating of Goshen, MA tornado on 25 February 2017 (per BOX PNS)
* CHANGE: Changed duplicate tornado entry on 25 August 2017 into a two-county tornado (per coordination with HGX)
* CHANGE: Changed duplicate tornado entry on 26 August 2017 into a two-county tornado (per coordination with HGX)
* REVERT: Reverted OM back to five digit running count
* ENHANCE: Create full-path and initial-point GIS files for tornado, wind, and hail
* UPDATE: Updated the 2018 Preliminary data through 30 August. Please note that not all tornadoes between July and August have been added to Storm Data and therefore may not be included in this update.
03 July 2018:
* Updated Release of the 2018 Severe Weather Database, including the finalized 2017 severe weather reports.
* Reprocessed 2016 tornado, wind, and hail data
* 'OM' numbers for 2016-2018 have been changed to the format: YYYY-NNNNN where YYYY is the 4-digit year and NNNNN is the five digit running count
* This is the anticipated last release using the current CSV format. A new, more intuitive format is planned for 2019. Example files should be provided later this year.
* Beginning with the 2016 data, loss values are in actual dollar amounts. This is consistent with what is reported by local NWS offices.
* Updated the 2018 Preliminary data through 30 June. Please note that not all tornadoes between April and June have been added to Storm Data and therefore may not be included in this update.
11 April 2018:
* Initial Release of the 2018 Severe Weather Database, including preliminary 2017 severe weather reports.
21 May 2017:
* Fix issued with duplicate 2016 reports and with the date format for 2016 entries
15 May 2017:
* Initial Release of the 2016 SPC Severe Weather Database
I (Patrick Marsh) became SPC's 3rd Warning Coordination Meteorologist in late 2016.
This means that the 2016 update to the SPC severe weather database is my first attempt at an update.
There is a high likelihood that there will be mistakes.
If you notice a mistake with the 2016 data, please email me at and I will try to fix the issue as quickly as possible.
For errors prior to 2016, please let me know as well, and I'll look into the issue, although since I did not put together those data, it will take more time to resolve.
Additionally, I am hoping to move from a once-a-year update to quarterly or even monthly updates.
A consequence of this change will be the potential for additional tornadoes to be added in time periods previously covered by an update.
I will attempt to document any changes in this changelog.